I replaced the cartridge and seals on my Colony Soft American Standard single handle kitchen faucet and the cartridge still leaks at the base.

I have the 4175.500 model faucet with the m951471-0070A spec cartridge.The American Standard part that was sent to me is the m951470-0070A. I spoke with someone from the company and they said that they are the same part.

Also,I noticed that the diverter is missing from the back, but maybe my sink did not come with one as I don't have a sprayer...

Do I need to tighten the screws more? This is my second try with a new cartridge. The first one that I ordered still leaked (a generic). I then purchased an authentic American Standard cartridge thinking that I needed the real brand part.

It still leaks. Also,it seems like one screw doesn't want to grab anymore. It finally did but when I was first messing with this it wasn't so difficult... I am afraid that I will overtighten the screws.. Any suggestions? Thank-you

To repair your leaky faucet, the first step is to shut off your water supply. First, look to see if there is a shut off valve under the fixture, if not there, then you can always turn off the hot water supply right at your water heater.

I think he has the shutting of the water off at this point Spaparts as he has already replaced the cartridge twice...

Did you get the ORING replacements for the faucet? If not, I suspect that the faucet has some SPOUT ORINGS that need to be lubricated and replaced. The valve does NOT have a diverter for exactly the reason you stated, "as I don't have a sprayer".

Get the ORING replacement parts (part #M964324-0070A and M960994-0070A) and some silicone grease and pull the cartridge and the spout up and off the valve body...grease and replace the ORINGS and rebuild the fauc\et. That should resolve the issue.

Click here for a parts diagram: http://www.americanstandard-us.com/assets/documents/amstd/parts/Parts_964.pdf

Mark